Download Aichi D3A1/2 Val (Crowood Aviation) by Peter C. Smith PDF

By Peter C. Smith

From the assault on Pearl Harbor to the kamikaze raids within the last levels of WWII, the Aichi Val used to be a effective eastern weapon that triggered significant harm to Allied ships and floor installations. utilizing legitimate files and the testimony of fellows who designed and flew it, Peter Smith tells the total tale of the Aichi D3A1/2 Val utilizing many infrequent photos and interviews with surviving staff individuals. jam-packed with a wealth of fabric by no means sooner than noticeable in this often-overlooked plane.

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Extra resources for Aichi D3A1/2 Val (Crowood Aviation)

Sample text

Service factors apply only when the voltage and frequency are held at the rated value. When a motor is operated continuously overloaded, the motor naturally has a higher temperature rise and, therefore may have an efficiency, power factor and speed different than the rated load. The locked-rotor torque, current and breakdown torque remain the same. It must be remembered that the temperature rise caused by operating a motor at a continuous service factor overload shortens the life of insulation and therefore the life of the motor.

3. Mechanical parts – bearings, fans, brushes (when used). Proper control of the driven load or number of motor starts required can also influence the winding losses. The losses occurring during full load operation of the motor can be divided into two groups: (1) fixed losses, running light losses (I2R no-load current losses), iron losses, bearing friction and internal fan (when used), and (2) applied losses of the driven load. The major heat losses are in the windings. There is a definite maximum temperature which the windings can withstand under a given load and with a given insulation without undue deterioration either within themselves or in the insulation.

The part-winding starter does not impose a limit on the starting duty cycle as does the auto-transformer since there is no insulated voltage reducing equipment which may over- heat. The part-winding motor starter is almost always an increment-start device. Not all motors can be partwinding started; it is quite important that the motor manufacturer be consulted before this type of starting is applied. Some motors are wound sectionally with partwinding starting in mind; indiscriminate application to any dual voltage motor (for example, a 220/440 volt motor which is to run at 220 volts) can lead to excessive noise and vibration during starting, to overheating, and to extremely high transient currents upon switching.

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